Janet Yellen, the chair of the Federal Reserve, has said that the Fed is likely to raise its benchmark interest rate sometime this year. Such a move would be the first rate rise since 2006. Whether the change occurs as early as the Fed’s meeting next week or later in the year is still a matter of speculation, but either way higher interest rates could affect your portfolio. So how much should you fret about the Fed’s potential move? The answer is “probably not too much.”